Check out
48 Ford Half Ton Pick Up It's a 48-52 ford chassis, but it's close to the 53 you are working on and he uses the factory cage on the jaguar. There are several good pictures but you have to go back a couple of pages of his build blog. I think the guy is a member here. This is one resource I have saved for when I put the XJ12L suspension under a future project. Should give you a idea of how it needs to be set up. ( I would of pm'd you, but I don't have enough messages on the board yet)
https://www.ford-trucks.com/forums/9...aguar-mix.html